ESP32S Dev Kit C V4 with ESPHome not working GPIO16

ESPHome
1

Good Morning.

I have an ESP32S Dev Kit C V4 here and would like to use it to implement my gate control.
(Including outside buttons, key switches and so on).
I have built a test circuit and everything actually works, except for my STOP relay.

The code is this one:

switch:

  - platform: gpio

    name: "TOR2 Relay AUF"

    pin: GPIO4

    id: TOR2_Relay_AUF

    inverted: true

    restore_mode: ALWAYS_OFF

  - platform: gpio

    name: "TOR2 Relay STOP"

    pin: GPIO16

    id: TOR2_Relay_STOP

    inverted: true

    restore_mode: ALWAYS_OFF    

  - platform: gpio

    name: "TOR2 Relay ZU"

    pin: GPIO17

    id: TOR2_Relay_ZU

    inverted: true

    restore_mode: ALWAYS_OFF

In all the sources of information I found, there were no specifics regarding PIN 16.
Therefore, I am very surprised that this pin is not pulled to ground, although it works fine with PIN 4 and 17.
My log says:

[07:34:54][D][switch:013]: 'TOR2 Relay STOP' Turning ON.
[07:34:54][D][switch:056]: 'TOR2 Relay STOP': Sending state ON
[07:34:55][D][switch:017]: 'TOR2 Relay STOP' Turning OFF.
[07:34:55][D][switch:056]: 'TOR2 Relay STOP': Sending state OFF

I have written a small code to force the relays only 500ms, so the relay switches off by itself.

Any ideas? Opinions?

Thanks
Gin